Aspects of Protonic Ionic Liquid as Electrolyte in Thermoelectric Generators

Laux, Edith; Uhl, Stefanie; Journot, Tony; Brossard, J.; Jeandupeux, Laure; Keppner, H.

doi:10.1007/s11664-016-4526-1

Cited by 41 publications

(21 citation statements)

References 3 publications

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“…2 However, a major disadvantage is the strong decline of the temperature difference between the warm and cold surfaces due to the too high thermal conductivity, and, thus, the output voltage. As ionic liquids have a lower thermal conductivity and therefore higher Seebeck-coefficients (SEs), 3 they might be more suitable despite a still lower power output compared to solid-state BiTe-TEGs.…”

Section: Introductionmentioning

confidence: 99%

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Thermoelectric Generators Based on Ionic Liquids

Laux

Uhl

Jeandupeux

et al. 2018

Journal of Elec Materi

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Looking at energy harvesting using body or waste heat for portable electronic or on-board devices, Ionic liquids are interesting candidates as thermoactive materials in thermoelectric generators (TEGs) because of their outstanding properties. Two different kinds of ionic liquid, with alkylammonium and choline as cations, were studied, whereby different anions and redox couples were combined. This study focussed on the intention to find non-hazardous and environmentally friendly ionic liquids for TEGs to be selected among the thousands that can potentially be used. Seebeck coefficients (SEs) as high as À 15 mV/K were measured, in a particular case for an electrode temperature difference of 20 K. The bottleneck of our TEG device is still the abundance of negative SE liquids matching the internal resistance with the existing positive SE-liquids at series connections. In this paper, we show further progress in finding increased negative SE liquids. For current extraction from the TEG, the ionic liquid must be blended with a redox couple, allowing carrier exchange in a cyclic process under a voltage which is incuced by the asymmetry of the generator in terms of hot and cold electrodes. In our study, two types of redox pairs were tested. It was observed that a high SE of an ionic liquid/redox blend is not a sufficient condition for high power output. It appears that more complex effects between the ionic liquid and the electrode determine the magnitude of the final current/power output. The physico-chemical understanding of such a TEG cell is not yet available.

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Section: Introductionmentioning

confidence: 99%

“…As an example, the integrated circuit EM8500 from EM Marin needs, under cold-start conditions, a voltage of 0.3 V and a power of 3 lW. 4 Ionic liquids show high SEs 3 ( Figs. 1 and 2); however, the power output of currently screened ionic liquids are still quite low compared to conventional materials such as BiTe.…”

Section: Introductionmentioning

confidence: 99%

Thermoelectric Generators Based on Ionic Liquids

Laux

Uhl

Jeandupeux

et al. 2018

Journal of Elec Materi

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“…Yet in ionic liquid systems, ions are unable to enter the external circuit, thermoelectric phenomenon of ionic liquids is explained by a different mechanism. The thermoelectric voltage originates from 1) thermal diffusion of ions ( Figure a) [ 63,64 ] and 2) adsorption and desorption of ions on electrodes (Figure 7b). [ 65 ] If the diffusion rate and desorption rate of cations and anions are different, a voltage difference is created between the hot electrode and cold electrode.…”

Section: Liquid Conductors For Soft Electronicsmentioning

confidence: 99%

“…[ 64 ] Under a given thermo‐gradient, different ionic diffusion leads to the occurrence of concentration gradients for different ions, which is known as the Soret effect. [ 63,142–144 ] As a result, a constant voltage is generated between the hot and cold electrodes. The efficiency of the thermoelectric conversion is given by a dimensionless parameter called “figure of merit” (ZT) as expressed in Equation ()

\begin{matrix} Z T = \frac{S^{2} T σ}{κ} \end{matrix}

where S is the Seebeck coefficient, σ is the electrical conductivity, T is the temperature, and κ is the thermal conductivity.…”

Section: Recent Progresses In Soft Electronics Based On Liquid Conducmentioning

confidence: 99%

Soft Electronics Based on Liquid Conductors

Gui

Wang

2020

Adv Elect Materials

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Soft electronics is an emerging field that is lending great convenience to daily life. Soft electronics have shown great potentials in health monitoring, soft robotics, the Internet of Things, and so forth. Though soft electronics based on solid conductors have been intensively investigated and some considerable progress has been achieved, the intrinsic shortcomings of solid conductors are becoming the Achilles’ heel of soft electronics. Fortunately, many of the disadvantages of solid conductors can be offset by liquid conductors. Following the attractive advantages of liquid materials, in particular high flexibility, infinite deformability, self‐healing, and ease of doping/being doped, this review article summarizes a history of soft electronics based on liquid conductors and introduces the most up‐to‐date liquid conducting materials together with their representative featured functions. Particular applications in sensors, batteries, supercapacitors, thermoelectric conversion, and even memory devices are discussed in detail to intuitively emphasize how liquid conductors benefit soft electronics. In addition, limitations of liquid conductors are also discussed, as well as the key challenges and some innovative strategies to overcome them. Finally, future perspectives are put forward to develop soft electronics that are fully composed of liquid circuits.

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“…[118,[128][129][130] These properties make ILs suitable candidates to be used in the TEGs and temperature sensors for low-grade temperature harvesting and sensing applications in wearable electronics or e-skin. [128] However, utilizing these materials in thermoelectric devices is challenging because the devices require proper sealing and encapsulation due to the liquid phase of these electrolytes. On the contrary, polymer-based electrolytes are more attractive since they can be made as free-standing gels while showing a high Seebeck coefficient.…”

Section: Applicationsmentioning

confidence: 99%